Android Open Source - sdl_tester_android Submenu Button

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License

The source code is released under:

Copyright (c) 2014, Ford Motor Company All rights reserved. Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are m...

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Java Source Code

package com.livio.sdl.menu;
//  w  ww.j  ava  2s .c  om
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;

/**
 * Represents a submenu button that can be clicked on the SDL-connected head-unit.  A submenu
 * contains all the fields contained in the MenuItem parent class, as well as maintaining a list
 * of children commands.
 *
 * @author Mike Burke
 *
 */
public class SubmenuButton extends MenuItem {

  private List<MenuItem> children;
  
  public SubmenuButton(SubmenuButton copy){
    super(copy.getName(), copy.getId(), true);
    copyChildren(copy.getChildren());
  }
  
  public SubmenuButton(String name, int id) {
    super(name, id, true);
  }
  
  /**
   * Creates a copy of the children to ensure there are no leaked references to the
   * children of the object we're copying.
   * 
   * @param children
   */
  private void copyChildren(List<MenuItem> children){
    if(children == null || children.size() <= 0){
      return;
    }
    
    if(this.children == null){
      this.children = new ArrayList<MenuItem>(children.size());
    }
    
    for(MenuItem child : children){
      if(child.isMenu()){
        this.children.add(new SubmenuButton((SubmenuButton) child));
      }
      else{
        this.children.add(new CommandButton((CommandButton) child));
      }
    }
  }
  
  /**
   * Returns a copy of the list of all children associated with this menu item.  If there
   * are no children associated with this menu item, this method will return an empty list.
   * 
   * @return A copy of the list of children
   */
  public List<MenuItem> getChildren(){
    if(children == null || children.size() <= 0){
      return Collections.emptyList();
    }
    
    return new ArrayList<MenuItem>(children);
  }
  
  /**
   * Adds a child to this submenu object.
   * 
   * @param item The item to add
   */
  public void addChild(MenuItem item){
    if(children == null){
      children = new ArrayList<MenuItem>();
    }
    
    children.add(item);
  }
  
  /**
   * Removes a child from this submenu object.
   * 
   * @param childId The id of the child to remove
   */
  public void removeChild(int childId){
    if(children == null || children.size() <= 0){
      return;
    }
    
    for(MenuItem child : children){
      if(childId == child.getId()){
        children.remove(child);
        return;
      }
    }
  }
  
  /**
   * Removes all children from this submenu object.
   */
  public void removeAllChildren(){
    if(children == null || children.size() <= 0){
      return;
    }
    
    children.clear();
  }

}

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